Two new species of Heteranthera (plus the two transferred from Hydrothrix and Scholeropsis) are missing
Pellegrini MOO, Horn CN (2017) Two peculiar new species of Heteranthera Ruiz & Pavón (Pontederiaceae) from Brazil, with notes on inflorescence architecture in the family. PhytoKeys
82: 35–56. https://doi.org/10.3897/phytokeys.82.13752

Elasis has two species
Pellegrini MOO (2017b) Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11–72. https://doi.org/10.3897/phytokeys.89.20388